1639948240 has 40 divisors (see below), whose sum is σ = 4357578240. Its totient is φ = 562267776.

The previous prime is 1639948223. The next prime is 1639948283. The reversal of 1639948240 is 428499361.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1463680 + ... + 1464799.

It is an arithmetic number, because the mean of its divisors is an integer number (108939456).

Almost surely, 2^1639948240 is an apocalyptic number.

1639948240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1639948240 is an abundant number, since it is smaller than the sum of its proper divisors (2717630000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1639948240 is a wasteful number, since it uses less digits than its factorization.

1639948240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928499 (or 2928493 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 1639948240 is about 40496.2743965417. The cubic root of 1639948240 is about 1179.2613015206.

The spelling of 1639948240 in words is "one billion, six hundred thirty-nine million, nine hundred forty-eight thousand, two hundred forty".